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migrations.go
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migrations.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package migrations
import (
"context"
"github.com/hashicorp/go-version"
)
// Migration defines a target version and functions to upgrade and/or downgrade.
type Migration struct {
TargetVersion *version.Version
Up func(ctx context.Context) error
Down func(ctx context.Context) error
}
// FirstRun returns version "zero".
func FirstRun() *version.Version {
obj, _ := version.NewVersion("0.0.0")
return obj
}
// Apply browses migrations upward on downward and apply them sequentially. It returns a version to be
// saved as the current valid version of the service, or nil if no changes were necessary. In specific case where
// current version is 0.0.0 (first run), it only applies first run migration (if any) and returns target version.
func Apply(ctx context.Context, current *version.Version, target *version.Version, migrations []*Migration) (*version.Version, error) {
if migrations == nil {
return target, nil
}
if target.GreaterThan(current) {
var successVersion *version.Version
for _, migration := range migrations {
v := migration.TargetVersion
if migration.Up != nil && (current.String() == "0.0.0" || v.GreaterThan(current)) && (v.LessThan(target) || v.Equal(target)) {
if err := migration.Up(ctx); err != nil {
return successVersion, err
}
successVersion, _ = version.NewVersion(v.String())
}
}
}
if target.LessThan(current) {
var successVersion *version.Version
for i := len(migrations) - 1; i >= 0; i-- {
migration := migrations[i]
v := migration.TargetVersion
if migration.Down != nil && v.GreaterThan(target) && (v.LessThan(current) || v.Equal(current)) {
if err := migration.Down(ctx); err != nil {
return successVersion, err
}
successVersion, _ = version.NewVersion(v.String())
}
}
}
return target, nil
}